:root {
  --bg: #f7f6f3;
  --card: #ffffff;
  --border: #e6e4df;
  --text: #1f2328;
  --muted: #6b7280;
  --accent: #e8630c;
  --accent-soft: #fdeee2;
  --ok: #16a34a;
  --err: #dc2626;
  --radius: 14px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

/* 头部 */
.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 20px 8px;
}

.brand { display: flex; align-items: center; gap: 12px; }

.logo {
  width: 44px;
  height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 22px;
  font-weight: 700;
  flex-shrink: 0;
}

.brand-text h1 { margin: 0; font-size: 22px; line-height: 1.3; }
.brand-text p { margin: 2px 0 0; font-size: 13px; color: var(--muted); }

.badge {
  font-size: 12px;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid #f6c9a8;
  border-radius: 999px;
  padding: 6px 12px;
  text-decoration: none;
}
.badge:hover { background: #fbe0c9; }

/* 标签页 */
.tabs {
  display: flex;
  gap: 8px;
  max-width: 980px;
  margin: 18px auto 0;
  padding: 0 20px;
  overflow-x: auto;
}

.tab {
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--text);
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 14px;
  cursor: pointer;
  white-space: nowrap;
}
.tab.active {
  background: var(--text);
  border-color: var(--text);
  color: #fff;
}
.tab:hover:not(.active) { border-color: var(--accent); color: var(--accent); }

/* 主区 */
main {
  max-width: 980px;
  margin: 0 auto;
  padding: 20px;
}

.panel {
  display: none;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px;
}
.panel.active { display: block; }

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 16px;
}
.panel-head h2 { margin: 0; font-size: 18px; }
.panel-tag { font-size: 12px; color: var(--muted); background: var(--bg); padding: 4px 10px; border-radius: 999px; }

.switch {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  color: var(--muted);
  cursor: pointer;
}
.switch input { accent-color: var(--accent); width: 16px; height: 16px; }

/* 表单 */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
.form-grid label { display: flex; flex-direction: column; gap: 6px; font-size: 14px; }
.span-2 { grid-column: span 2; }

.field-name { font-size: 13px; font-weight: 600; }

select, input[type="text"], textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  color: var(--text);
  resize: vertical;
}
select:focus, input[type="text"]:focus, textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(232, 99, 12, 0.12);
}

.actions { display: flex; gap: 10px; margin-top: 16px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  font-family: inherit;
}
.btn.primary { background: var(--accent); color: #fff; }
.btn.primary:hover { background: #d4560a; }
.btn.primary:disabled { background: #e9a274; cursor: not-allowed; }
.btn.ghost { background: #fff; border-color: var(--border); color: var(--text); }
.btn.ghost:hover { border-color: var(--accent); color: var(--accent); }

/* 聊天 */
.chat-box {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  padding: 16px;
  min-height: 320px;
  max-height: 460px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.msg {
  max-width: 78%;
  padding: 10px 14px;
  border-radius: 14px;
  font-size: 14px;
  white-space: pre-wrap;
  word-break: break-word;
}
.msg.user {
  align-self: flex-end;
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 4px;
}
.msg.bot {
  align-self: flex-start;
  background: #fff;
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}
.msg .model-tag {
  display: block;
  margin-top: 6px;
  font-size: 11px;
  opacity: 0.7;
}
.msg.bot .model-tag { color: var(--muted); }
.msg.user .model-tag { color: rgba(255, 255, 255, 0.75); }

.chat-input {
  display: flex;
  gap: 10px;
  margin-top: 12px;
}
.chat-input textarea { flex: 1; min-height: 44px; max-height: 120px; }

/* 输出 */
.output-wrap {
  margin-top: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.output-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 14px;
  background: var(--bg);
  font-size: 13px;
  font-weight: 600;
}
.output-text {
  margin: 0;
  padding: 16px;
  font-size: 14px;
  white-space: pre-wrap;
  word-break: break-word;
  font-family: inherit;
  max-height: 480px;
  overflow-y: auto;
}

/* 图片 */
.image-result {
  margin-top: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  text-align: center;
}
.image-result img {
  max-width: 100%;
  max-height: 560px;
  border-radius: 10px;
}
.image-result .actions { justify-content: center; }

/* 通用 */
.hint { font-size: 12px; color: var(--muted); margin: 10px 0 0; }
.model-note { margin-top: 4px; }
.hidden { display: none !important; }

.error-box {
  border: 1px solid #f3c1c1;
  background: #fdf0f0;
  color: var(--err);
  border-radius: 10px;
  padding: 10px 14px;
  font-size: 13px;
  margin-top: 14px;
}

/* 页脚 */
.site-footer {
  max-width: 980px;
  margin: 0 auto;
  padding: 20px;
  font-size: 12px;
  color: var(--muted);
}
.site-footer p { margin: 4px 0; }

@media (max-width: 640px) {
  .form-grid { grid-template-columns: 1fr; }
  .span-2 { grid-column: span 1; }
  .msg { max-width: 92%; }
}

/* ---------- 登录遮罩 ---------- */
.login-overlay {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(247, 246, 243, 0.92);
  backdrop-filter: blur(6px);
  padding: 20px;
}
.login-card {
  width: 100%;
  max-width: 420px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 20px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.1);
  padding: 32px 28px;
  text-align: center;
}
.login-card .logo {
  width: 56px;
  height: 56px;
  font-size: 28px;
  border-radius: 16px;
  margin: 0 auto 14px;
}
.login-card h1 { margin: 0 0 4px; font-size: 22px; }
.login-card .sub { margin: 0 0 18px; font-size: 13px; color: var(--muted); }
.login-rules {
  list-style: none;
  margin: 0 0 20px;
  padding: 14px 16px;
  text-align: left;
  background: var(--bg);
  border-radius: 12px;
  font-size: 13px;
  color: var(--muted);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.login-rules strong { color: var(--text); }
.btn.big { width: 100%; justify-content: center; padding: 12px 20px; font-size: 15px; }

/* ---------- 顶部积分栏 ---------- */
.user-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  max-width: 980px;
  margin: 14px auto 0;
  padding: 0 20px;
}
.credits-box {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  background: var(--accent-soft);
  border: 1px solid #f6c9a8;
  color: var(--accent);
  border-radius: 999px;
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 600;
}
.credits-box .credits-sub { font-size: 11px; font-weight: 400; color: var(--muted); }
.redeem-box {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}
.redeem-box input {
  width: 130px;
  padding: 7px 12px;
  text-transform: uppercase;
  letter-spacing: 2px;
  text-align: center;
}
.redeem-msg { font-size: 12px; color: var(--muted); }
.redeem-msg.ok { color: var(--ok); }
.redeem-msg.err { color: var(--err); }
.cost-note {
  max-width: 980px;
  margin: 8px auto 0;
  padding: 0 20px;
  font-size: 12px;
  color: var(--muted);
}